Consider the below piece of code, its written in Swift and it uses Async/Await. In order to use this code in Swift, you would do this This can be called from objective-c directly as follows The Objective-C method implementation synthesized by the compiler will create a detached task that calls the async Swift method perform(operation:) with the given string,
Let’s say you have the following method in objective-c When you import this in Swift, you will be importing the code as follows As you can see from the above code, you are actually importing as implicitly unwrapped optionals. This can be a problem, if you are trying to unwrap a null object. You can
Timer dispatch sources generate events at regular, time-based intervals. You can use timers to initiate specific tasks that need to be performed regularly. For example, games and other graphics-intensive applications might use timers to initiate screen or animation updates. You could also set up a timer and use the resulting events to check for new
Before you start reading this tutorial, please read about method swizzling. The Objective-C model of object-oriented programming is based on message passing to object instances. In Objective-C one does not call a method; one sends a message. In Objective-C, the target of a message is resolved at runtime, with the receiving object itself interpreting the message. A method is identified
You can use the WKWebView class to embed web content in your app. To do so, create a WKWebView object, set it as the view, and send it a request to load web content. After creating a new WKWebView object using the initWithFrame:configuration: method, you need to load the web content. Use the loadHTMLString:baseURL: method to begin loading local HTML files or the loadRequest: method to begin
If you have multiple targets use config files. This is the way to create them. Below is a sample of what you can specify in the config files. ARCHS = arm64 CLANG_CXX_LANGUAGE_STANDARD = gnu++98 CLANG_CXX_LIBRARY = libstdc++ LD_NO_PIE = NO OTHER_LDFLAGS = -Wl,-warn_compact_unwind HEADER_SEARCH_PATHS = ../code/ FRAMEWORK_SEARCH_PATHS = ../debug One of the things you can
For threaded code, locks are one of the traditional ways to synchronize access to resources that are shared between threads. However, the use of locks comes at a cost. Even in the non-contested case, there is always a performance penalty associated with taking a lock. And in the contested case, there is the potential for
Delegates are a very simple and straight forward feature in objective C. Some of its usage scenarios can be when you want to pass data between two controllers, or set a value when something happens..etc. You can do the same using blocks. Disclaimer: I am not trying to compare between these two programming techniques. In
You can check out the code here:https://github.com/kmdarshan/PhotoUpload.git
[sourcecode language=”objc”] – (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]]; // Override point for customization after application launch. UIViewController *viewController1 = [[TPFirstViewController alloc] init]; UIViewController *viewController2 = [[TPSecondViewController alloc] init]; self.tabBarController = [[UITabBarController alloc] init]; UINavigationController *controller1 = [[UINavigationController alloc] initWithRootViewController:viewController1]; self.tabBarController.viewControllers = @[controller1, viewController2]; self.window.rootViewController = self.tabBarController; [self.window makeKeyAndVisible];
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View the code on Gist.
Use these #defines to make your life easy : [sourcecode language=”objc”] #define IS_IPAD ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPad) #define IS_IPAD_LOW_RES ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPad && [[UIScreen mainScreen] scale] == 1.0) #define IS_IPHONE ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone) [/sourcecode]
Safest bet when handling facebook ids is to user a NSString for handling them. If you are still keen on using an int, you better use unsigned long long, since the just using unsigned long will give you a error. Below is an example on how to do this : [sourcecode lang=”objc”] NSNumberFormatter * f
To display images via instagram, I would be using CoreData and UITableViewController. I choose to use table view controller, since the cells are automatically reused, instead of creating new ones. Also the memory allocation and deallocation is handled by the OS. For this tutorial we would display four photos in each row. Let me dive
Ever wondered how you can turn a view along the x-axis or y-axis. You can do that using the CATransform3DMakeRotation in iOS. Its pretty cool. You can use animation to even make it more awesome. In the CATransform3DMakeRotation method you can change the x,y,z values to 1 for rotating the views along the respective axis. Some uses
[sourcecode lang=”objc”] – (CGFloat)widthOfString:(NSString *)string withFont:(UIFont *)font { NSDictionary *attributes = [NSDictionary dictionaryWithObjectsAndKeys:font, kCTFontAttributeName, nil]; return [[[NSAttributedString alloc] initWithString:string attributes:attributes] size].width; } [/sourcecode]
Unable to set the title of UINavigation Controller – In order to set the title, you need to set the title of the view controller. For this you need to have a navigation controller, and set its title. Then you can hide the navigation controller, if you wish. I have pasted the sample code below.
Question: I have a segmented control with 8 segments. I can change the default tintColor of the whole control, BUT can I set a different color for each segment in the control? I found a tutorial that worked in 5.1 with a new class that calls this method, “-(void)setTintColor:(UIColor*)color forTag:(NSInteger)aTag” But it doesn’t work in
With the release of iOS 6, facebook is integrated into the iOS environment. In the previous version, if you needed a user to login into fb, there was an app switch which used to take place. But with 6, if the user if logged into fb via settings, the OS authenticates it directly without any
Updated my project to include pull to refresh. In the latest iteration of ios 6, you really need UIRefreshControl to accomplish. Its that simple. Try it out…. Checkout the clone from github.
FYI: Bad code..here…The code is not formatted correctly and written in a hurry. But it does the job. Also, edge cases to handle tons of images and nil values are not handled. It can be refined better. You can checkout the code here: git://github.com/kmdarshan/instagram_pics.git
When you copy a block, any references to other blocks from within that block are copied if necessary—an entire tree may be copied (from the top). If you have block variables and you reference a block from within the block, that block will be copied. When you copy a stack-based block, you get a new
I know this is pretty easy, creating a table view inside a view. Always we must set the delegate and the data source of that table to self, else you will end up having just the tableview without any data in it. [sourcecode language=”objc”] // add the delegates to the interface as shown below @interface
It would display the size of the image. [sourcecode language=”objc”] NSLog(@"Image size: %@", NSStringFromCGSize(image.size)); [/sourcecode]
There are two ways to do this. option 1 ) [sourcecode language=”objc”] CGSize size = [self.view bounds].size; UIGraphicsBeginImageContext(size); [[self.view layer] renderInContext:UIGraphicsGetCurrentContext()]; UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); [/sourcecode] The above code is helpful when you have static uiviews. Consider you have a many uiviews and you are moving them around with gestures. At this instant, if
the best way to check for NSNull when reading from a API : [ this is just an example you can modify it however you want ]
I had to refer to this in my blog, because its one of those examples out there which makes it really easy to understand the difference between strong and weak pointers.First of, I will copy the apple definitions and then paste the example, see the difference. __strong is the default. An object remains “alive” as long
=== BUILDING NATIVE TARGET facebook-ios-sdk OF PROJECT facebook-ios-sdk WITH CONFIGURATION Release === Checking Dependencies… error: There is no SDK with specified name or path ‘Unknown Path’ ** BUILD FAILED ** iOS Simulator build failed If you are getting this error, you need to go to the script: ./build_facebook_ios_sdk_static_lib.sh alter the path as shown below: [sourcecode